ZUKIWORLD Online | Suzuki 4x4 Editorial and Forum
ZUKIWORLD Discussion Forum => Technical Discussion - Performance / Modify => Topic started by: iadr on June 17, 2025, 09:32:31 AM
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2004 Grand Vitara, 2.5 V6. Canadian Spec (should be same as US?).
The 4sp Auto is set to kick down way way too often. I would rather it didn't kick down except in extreme circumstances.
I would like to find my TCM so that I can try a plan I have. Where is my TCM located? Bonus if you can tell me colour codes at the plug.
My plan is to run a rheostat in the sensor feed coming from the throttle position sensor to the TCM, so it thinks it's at 40-50% throttle when it's at 75-80% throttle, so as to eliminate a number of kick down actions. This would be done by running that signal to ground via a resistor.
If that works great, if not then I'll run a junkyard TPS, run 12V to it and let it send out a fixed 40% TPS signal.
My one concern is the transmission lowers internal (band) pressures drop at lower throttle positions, like some of the old mechanical systems did for a softer shift feel. If so, then I may end up with more torque at a lower internal pressure, causing slippage.
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The 2004 doesn't have a separate TCM, the TCM function is integrated into the ECM, and the kickdown function is done via a cable.